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author | Michael Ellerman <mpe@ellerman.id.au> | 2014-05-23 18:15:29 +1000 |
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committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-05-28 13:35:37 +1000 |
commit | 3102f7843c75014fa15d3e6fda3b49f61bc467b4 (patch) | |
tree | 16ab9545e46162b3c6735d13be0b8a04292b7098 /arch/powerpc/include | |
parent | 6f5e40a3001d2497a134386a173e3ec3fdf2ad0b (diff) | |
download | linux-3102f7843c75014fa15d3e6fda3b49f61bc467b4.tar.gz linux-3102f7843c75014fa15d3e6fda3b49f61bc467b4.tar.bz2 linux-3102f7843c75014fa15d3e6fda3b49f61bc467b4.zip |
powerpc/kvm/book3s_hv: Use threads_per_subcore in KVM
To support split core on POWER8 we need to modify various parts of the
KVM code to use threads_per_subcore instead of threads_per_core. On
systems that do not support split core threads_per_subcore ==
threads_per_core and these changes are a nop.
We use threads_per_subcore as the value reported by KVM_CAP_PPC_SMT.
This communicates to userspace that guests can only be created with
a value of threads_per_core that is less than or equal to the current
threads_per_subcore. This ensures that guests can only be created with a
thread configuration that we are able to run given the current split
core mode.
Although threads_per_subcore can change during the life of the system,
the commit that enables that will ensure that threads_per_subcore does
not change during the life of a KVM VM.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Acked-by: Alexander Graf <agraf@suse.de>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include')
0 files changed, 0 insertions, 0 deletions